Abstract
WHILE it is established from the work of Wood1 and others that, after plastic deformation of a polycrystalline metal aggregate, residual lattice strains are left in the individual grains at normal temperature, considerable speculation still exists as to the origin and distribution of these strains. It is customary to apply X-ray diffraction methods to this problem, and as has often been pointed out, owing to the selective properties of the X-ray technique, the strain measured, using any particular X-radiation, is a mean of the lattice strains in only those grains in the aggregate which are suitably oriented to reflect the incident beam. By using different radiations, Greenough2,3 has shown for a number of metals that residual lattice strains in plastically extended aggregates are present which vary in both magnitude and sign, depending upon the orientation of the particular grains examined.
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